Question

The bottom of a box has a surface area of 25.0 cm2. The mass of the box is 34.0 kilograms. Acceleration due to gravity at sea level is 9.80 m/s2. What pressure is exerted by the box where it rests? 1.36 N/cm2 13.3 N/cm2 0.139 N/cm2 7.21 N/cm2

Answer 1

Pressure is the force exerted per area in a system.  Force is equal to the mass times the acceleration. In this case, force is equal to the weight. We calculate pressure as follows:

P = F/A
P = mg/A
P = 34.0 (9.8) / 25.0
P = 13.3 N/cm^2

Therefore, the second option is the answer.

Answer 2

Pressure is given by:
Pressure=(Force)/(Area)
Force=mass*gravitational pull
mass=34 Kg
gravity=9.80
thus;
Force=34*9.8=333.2
thus;
pressure=333.2/25=13.328=13.3 N/cm^2